Anna Efimenko
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View article: Local solid-state processes adjust the selectivity in catalytic oxidation reactions on cobalt oxides
Local solid-state processes adjust the selectivity in catalytic oxidation reactions on cobalt oxides Open
Transition metal oxides are excellent catalysts for selective oxidation reactions, which are a prominent source of industrially relevant chemicals. However, these reactions suffer from multiple competing reaction pathways, limiting the sel…
View article: Coexistence of Insulatorlike Paramagnon and Metallic Spin-Orbit Exciton Modes in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>SrIrO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math>
Coexistence of Insulatorlike Paramagnon and Metallic Spin-Orbit Exciton Modes in Open
We probe the spectrum of elementary excitations in SrIrO 3 by using heterostructured [ ( SrIrO 3 ) m / ( SrTiO 3 ) l ] samples to approach the bulk limit. Our resonant inelastic x-ray scattering (R…
View article: Exploring Low Energy Excitations in the d5 Iridate Double Perovskites La2BIrO6 (B = Zn, Mg)
Exploring Low Energy Excitations in the d5 Iridate Double Perovskites La2BIrO6 (B = Zn, Mg) Open
We experimentally investigate the structural, magnetic, transport, and electronic properties of two d5 iridate double perovskite materials La2BIrO6 (B = Mg, Zn). Notably, despite similar crystallographic structure, the two compounds show d…
View article: Single Atom Sites in Ga‐Ni Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Selective Ethylene Oligomerization
Single Atom Sites in Ga‐Ni Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Selective Ethylene Oligomerization Open
Supported catalytically active liquid metal solutions (SCALMS) are materials composed of a liquid metal alloy deposited on a porous support. Due to the dynamic properties of the liquid metal alloy, these systems are suggested to form singl…
View article: Thermal Activation and Deactivation of Ni‐Doped Ceria Catalysts in CO<sub>2</sub> Methanation
Thermal Activation and Deactivation of Ni‐Doped Ceria Catalysts in CO<sub>2</sub> Methanation Open
Discovered almost 130 years ago by P. Sabatier, CO 2 hydrogenation to methane (CO 2 methanation) is presently attracting attention as one of the most promising methods for storing intermittent renewable energy in the form of chemical fuels…
View article: Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO$_3$
Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO$_3$ Open
We probe the spectrum of elementary excitations in SrIrO$_3$ by using heterostructured [(SrIrO$_3$)$_m$/(SrTiO$_3$)$_l$] samples to approach the bulk limit. Our resonant inelastic x-ray scattering (RIXS) measurements at the Ir $L_3$-edge r…
View article: Unravelling the mechanistic complexity of the oxygen evolution reaction and Ir dissolution in highly dimensional amorphous hydrous iridium oxides
Unravelling the mechanistic complexity of the oxygen evolution reaction and Ir dissolution in highly dimensional amorphous hydrous iridium oxides Open
Alternative atomistic model describing OER and Ir dissolution in amorphous, hydrous iridium oxides derived from synchrotron-based X-ray spectroscopies and DFT.
View article: Physical properties of the ferromagnetic quantum critical system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$
Physical properties of the ferromagnetic quantum critical system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ Open
We report on single crystal growth and physical properties of the quantum critical Kondo-lattice system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ with $0\leq x\leq 1$ which hosts a ferromagnetic quantum critical point at $x \approx 0.1$. We performe…
View article: Elucidating the Complex Oxidation Behavior of Aqueous H<sub>3</sub>PO<sub>3</sub> on Pt Electrodes via <i>In Situ</i> Tender X-ray Absorption Near-Edge Structure Spectroscopy at the P <i>K</i>-Edge
Elucidating the Complex Oxidation Behavior of Aqueous H<sub>3</sub>PO<sub>3</sub> on Pt Electrodes via <i>In Situ</i> Tender X-ray Absorption Near-Edge Structure Spectroscopy at the P <i>K</i>-Edge Open
In situ tender X-ray absorption near-edge structure (XANES) spectroscopy at the P K-edge was utilized to investigate the oxidation mechanism of aqueous H3PO3 on Pt electrodes under various conditions relevant to high-temperature polymer el…
View article: Uncovering the critical function of lanthanum in CH<sub>4</sub> production from CO<sub>2</sub> using exsolved LaNiO<sub>3</sub> perovskite catalysts
Uncovering the critical function of lanthanum in CH<sub>4</sub> production from CO<sub>2</sub> using exsolved LaNiO<sub>3</sub> perovskite catalysts Open
The exsolved LaNiO 3 perovskite catalyst exhibits superior performance compared to supported Ni/La 2 O 3 attributed to the critical La–Ni arrangement differences, including Ni encapsulation and lanthana's affinity for hydroxide/carbonate f…
View article: Charge compensation in a layered van der Waals NiPS<sub>3</sub> host through various cationic intercalations
Charge compensation in a layered van der Waals NiPS<sub>3</sub> host through various cationic intercalations Open
Electrochemical cation intercalation into 2D NiPS 3 leads either to reduction of the (P 2 S 6 ) 4− units (Li example) or Ni cations (Na example), or causes electrochemical reduction and decomposition of EMIM cations within the van der Waal…
View article: Core-Level Spectroscopy with Hard and Soft X-rays on Phosphorus-Containing Compounds for Energy Conversion and Storage
Core-Level Spectroscopy with Hard and Soft X-rays on Phosphorus-Containing Compounds for Energy Conversion and Storage Open
The electronic properties of nine solid phosphorus (P)-containing compounds with varying oxidation states and chemical environments, including GaP(–III), InP(–III), red-P(0), H3P(III)O3, Na2H2P2(IV)O6, H3P(V)O4, KH2P(V)O4, Na2HP(V)O4, and …
View article: Direct Evidence of Dynamic Metal Support Interactions in Co/TiO2 Catalysts by Near-Ambient Pressure X-ray Photoelectron Spectroscopy
Direct Evidence of Dynamic Metal Support Interactions in Co/TiO2 Catalysts by Near-Ambient Pressure X-ray Photoelectron Spectroscopy Open
The interaction between metal particles and the oxide support, the so-called metal–support interaction, plays a critical role in the performance of heterogenous catalysts. Probing the dynamic evolution of these interactions under reactive …
View article: Core-Hole Spectroscopy of Energy Conversion and Storage-Related Phosphorus Compounds Using Soft and Hard X rays (Experimental XANES dataset)
Core-Hole Spectroscopy of Energy Conversion and Storage-Related Phosphorus Compounds Using Soft and Hard X rays (Experimental XANES dataset) Open
Dear readers, In the following, we provide the complete experimental X-ray absorption near-edge structure (XANES) spectroscopy dataset given in our investigation of: "Core-Hole Spectroscopy of Energy Conversion and Storage Related-Phosphor…
View article: Core-Hole Spectroscopy of Energy Conversion and Storage-Related Phosphorus Compounds Using Soft and Hard X rays (Experimental XANES dataset)
Core-Hole Spectroscopy of Energy Conversion and Storage-Related Phosphorus Compounds Using Soft and Hard X rays (Experimental XANES dataset) Open
Dear readers, In the following, we provide the complete experimental X-ray absorption near-edge structure (XANES) spectroscopy dataset given in our investigation of: "Core-Hole Spectroscopy of Energy Conversion and Storage Related-Phosphor…
View article: Strain engineering of the charge and spin-orbital interactions in Sr <sub>2</sub> IrO <sub>4</sub>
Strain engineering of the charge and spin-orbital interactions in Sr <sub>2</sub> IrO <sub>4</sub> Open
Significance Understanding the relationship between entangled degrees of freedom (DOF) is a central problem in correlated materials and the possibility to influence their balance is promising toward realizing novel functionalities. In Sr 2…
View article: Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4 Open
Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be und…
View article: Electronic signature of the vacancy ordering in NbO (Nb3O3)
Electronic signature of the vacancy ordering in NbO (Nb3O3) Open
We investigated the electronic structure of the vacancy-ordered 4d-transition metal monoxide NbO (Nb3O3) using angle-integrated soft- and hard-x-ray photoelectron spectroscopy as well as ultra-violet angle-resolved photoelectron spectrosco…